Techniques for indicating selection of channel state information (csi) report setting option by a demodulation reference signal (dmrs) pattern

ABSTRACT

The present disclosure relates to selections of a channel state information (CSI) report setting option by a distinct demodulation reference signal (DMRS) pattern. Specifically, in one aspect, a user equipment (UE) may determine a CSI transmission setting based on the at least one measurement of the communication channel, the CSI transmission setting is associated with a distinct DMRS pattern, and transmit a CSI report with the distinct DMRS pattern to the network entity in accordance with the CSI transmission setting. In another aspect, a network entity may transmit CSI setting configuration information to a UE, the CSI setting configuration information including at least one parameter corresponding to a channel measurement threshold that triggers selection of a distinct DMRS pattern based on a CSI transmission setting, and receive a CSI report and the distinct DMRS pattern from the UE associated with the CSI transmission setting.

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application claims the benefit of U.S. Provisional PatentApplication No. 63/016,842, entitled “TECHNIQUES FOR INDICATINGSELECTION OF CHANNEL STATE INFORMATION (CSI) REPORT SETTING OPTION BY ADEMODULATION REFERENCE SIGNAL (DMRS) PATTERN” and filed on Apr. 28,2020, which is expressly incorporated by reference herein in itsentirety.

BACKGROUND

Aspects of the present disclosure relate generally to wirelesscommunication systems, and more particularly, to indicating selection ofa channel state information (CSI) report setting option by ademodulation reference signal (DMRS) pattern.

Wireless communication systems are widely deployed to provide varioustypes of communication content such as voice, video, packet data,messaging, broadcast, and so on. These systems may be multiple-accesssystems capable of supporting communication with multiple users bysharing the available system resources (such as time, frequency, andpower). Examples of such multiple-access systems include code-divisionmultiple access (CDMA) systems, time-division multiple access (TDMA)systems, frequency-division multiple access (FDMA) systems, andorthogonal frequency-division multiple access (OFDMA) systems, andsingle-carrier frequency division multiple access (SC-FDMA) systems.

These multiple access technologies have been adopted in varioustelecommunication standards to provide a common protocol that enablesdifferent wireless devices to communicate on a municipal, national,regional, and even global level. For example, a fifth generation (5G)wireless communications technology (which can be referred to as NR) isenvisaged to expand and support diverse usage scenarios and applicationswith respect to current mobile network generations. In some aspects, 5Gcommunications technology can include: enhanced mobile broadband (eMBB)addressing human-centric use cases for access to multimedia content,services and data; ultra-reliable-low latency communications (URLLC)with certain specifications for latency and reliability; and massivemachine type communications (mMTC), which can allow a very large numberof connected devices and transmission of a relatively low volume ofnon-delay-sensitive information.

For example, for various communications technology such as, but notlimited to NR, some aspects may increase transmission speed andflexibility but also transmission complexity. Thus, improvements inwireless communication operations may be desired.

SUMMARY

The following presents a simplified summary of one or more aspects inorder to provide a basic understanding of such aspects. This summary isnot an extensive overview of all contemplated aspects, and is intendedto neither identify key or critical elements of all aspects nordelineate the scope of any or all aspects. Its sole purpose is topresent some concepts of one or more aspects in a simplified form as aprelude to the more detailed description that is presented later.

An example aspect includes a method of wireless communication at a userequipment (UE) including obtaining at least one measurement of acommunication channel associated with a network entity, determining achannel state information (CSI) transmission setting based on the atleast one measurement of the communication channel, wherein the CSItransmission setting is associated with a distinct demodulationreference signal (DMRS) pattern, and transmitting a CSI report with thedistinct DMRS pattern to the network entity in accordance with the CSItransmission setting.

Another aspect of the subject matter described in this disclosure can beimplemented in an apparatus for wireless communication. The apparatusmay include memory and a processor in communication with the memory. Theprocessor may be configured to obtain at least one measurement of acommunication channel associated with a network entity. The processormay further be configured to determine a CSI transmission setting basedon the at least one measurement of the communication channel, whereinthe CSI transmission setting is associated with a distinct DMRS pattern.The processor may further be configured to transmit a CSI report withthe distinct DMRS pattern to the network entity in accordance with theCSI transmission setting.

A further aspect of the subject matter described in this disclosure canbe implemented in an apparatus for wireless communication. The apparatusmay include means for obtaining at least one measurement of acommunication channel associated with a network entity. The means fordetermining a CSI transmission setting based on the at least onemeasurement of the communication channel, wherein the CSI transmissionsetting is associated with a distinct DMRS pattern. The means fortransmitting a CSI report with the distinct DMRS pattern to the networkentity in accordance with the CSI transmission setting.

Another aspect of the subject matter described in this disclosure can beimplemented in a non-transitory computer-readable mediumcomputer-readable medium including stored instructions ofcommunications, executable by a processor to obtain at least onemeasurement of a communication channel associated with a network entity,determine a CSI transmission setting based on the at least onemeasurement of the communication channel, wherein the CSI transmissionsetting is associated with a distinct DMRS pattern, and transmit a CSIreport with the distinct DMRS pattern to the network entity inaccordance with the CSI transmission setting.

Another example aspect includes method of wireless communication at anetwork entity including transmitting CSI setting configurationinformation to a UE, the CSI setting configuration information includingat least one parameter corresponding to a channel measurement thresholdthat triggers selection of a distinct DMRS pattern based on a CSItransmission setting, and receiving a CSI report with the distinct DMRSpattern from the UE associated with the CSI transmission setting.

Another aspect of the subject matter described in this disclosure can beimplemented in an apparatus for wireless communication. The apparatusmay include memory and a processor in communication with the memory. Theprocessor may be configured to transmit CSI setting configurationinformation to a UE, the CSI setting configuration information includingat least one parameter corresponding to a channel measurement thresholdthat triggers selection of a distinct DMRS pattern based on a CSItransmission setting. The processor may further be configured to receivea CSI report with the distinct DMRS pattern from the UE associated withthe CSI transmission setting.

A further aspect of the subject matter described in this disclosure canbe implemented in an apparatus for wireless communication. The apparatusmay include means for transmitting CSI setting configuration informationto a UE, the CSI setting configuration information including at leastone parameter corresponding to a channel measurement threshold thattriggers selection of a distinct DMRS pattern based on a CSItransmission setting. The apparatus means for receiving a CSI reportwith the distinct DMRS pattern from the UE associated with the CSItransmission setting.

Another aspect of the subject matter described in this disclosure can beimplemented in a non-transitory computer-readable mediumcomputer-readable medium including stored instructions ofcommunications, executable by a processor to transmit CSI settingconfiguration information to a UE, the CSI setting configurationinformation including at least one parameter corresponding to a channelmeasurement threshold that triggers selection of a distinct DMRS patternbased on a CSI transmission setting, and receive a CSI report with thedistinct DMRS pattern from the UE associated with the CSI transmissionsetting.

To the accomplishment of the foregoing and related ends, the one or moreaspects include the features hereinafter fully described andparticularly pointed out in the claims. The following description andthe annexed drawings set forth in detail certain illustrative featuresof the one or more aspects. These features are indicative, however, ofbut a few of the various ways in which the principles of various aspectsmay be employed, and this description is intended to include all suchaspects and their equivalents.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates an example of a wireless communication system.

FIG. 2 is a block diagram illustrating an example of a network entity(also referred to as a base station).

FIG. 3 is a block diagram illustrating an example of a user equipment(UE).

FIG. 4 is an example representation of a channel state information (CSI)report.

FIG. 5 is a flowchart of an example method of wireless communication ata UE.

FIG. 6 is a flowchart of an example method of wireless communication ata network entity.

FIG. 7 is a block diagram illustrating an example of a MIMOcommunication system including a base station and a UE.

Like reference numbers and designations in the various drawings indicatelike elements.

DETAILED DESCRIPTION

Various aspects are now described with reference to the drawings. In thefollowing description, for purposes of explanation, numerous specificdetails are set forth in order to provide a thorough understanding ofone or more aspects. It may be evident, however, that such aspect(s) maybe practiced without these specific details.

The described features generally relate to indicating selection of achannel state information (CSI) report setting option by a demodulationreference signal (DMRS) pattern. Specifically, the present disclosureincludes a method, apparatus, and non-statutory computer readable mediumfor wireless communications at a user equipment (UE) including obtainingat least one measurement of a communication channel associated with anetwork entity, such as a downlink reception quality indicator, areference signal received power (RSRP), or a signal-to-interferencenoise ratio (SINR). The aspects may further include determining a CSItransmission setting corresponding to one of a repetitious CSItransmission setting or a non-repetitious CSI transmission setting basedon the at least one measurement of the communication channel, the CSItransmission setting is associated with a distinct DMRS pattern, andtransmitting a CSI report with the distinct DMRS pattern to the networkentity in accordance with the CSI transmission setting.

The present disclosure further includes a method, apparatus, andnon-statutory computer readable medium for wireless communications at anetwork entity including transmitting CSI setting configurationinformation to a UE, the CSI setting configuration information includingat least one parameter corresponding to a channel measurement thresholdthat triggers selection of a distinct DMRS pattern based on a CSItransmission setting, and receiving a CSI report with the distinct DMRSpattern from the UE associated with the CSI transmission setting.

Particular implementations of the subject matter described in thisdisclosure can be implemented to realize one or more of the followingpotential advantages. For example, coverage of CSI report transmissionsmay be improved by indicating a selection of a CSI report setting optionbased on a DMRS pattern. As a result, the reliability of beam managementfor unicast channels may be increased.

As used in this application, the terms “component,” “module,” “system”and the like are intended to include a computer-related entity, such asbut not limited to hardware, software, a combination of hardware andsoftware, or software in execution. For example, a component may be, butis not limited to being, a process running on a processor, a processor,an object, an executable, a thread of execution, a program, or acomputer. By way of illustration, both an application running on acomputing device and the computing device can be a component. One ormore components can reside within a process or thread of execution and acomponent can be localized on one computer or distributed between two ormore computers. In addition, these components can execute from variouscomputer readable media having various data structures stored thereon.The components can communicate by way of local or remote processes suchas in accordance with a signal having one or more data packets, such asdata from one component interacting with another component in a localsystem, distributed system, or across a network such as the Internetwith other systems by way of the signal. Software shall be construedbroadly to mean instructions, instruction sets, code, code segments,program code, programs, subprograms, software modules, applications,software applications, software packages, routines, subroutines,objects, executables, threads of execution, procedures, functions, etc.,whether referred to as software, firmware, middleware, microcode,hardware description language, or otherwise.

Techniques described herein may be used for various wirelesscommunication systems such as CDMA, TDMA, FDMA, OFDMA, SC-FDMA, andother systems. The terms “system” and “network” may often be usedinterchangeably. A CDMA system may implement a radio technology such asCDMA2000, Universal Terrestrial Radio Access (UTRA), etc. CDMA2000covers IS-2000, IS-95, and IS-856 standards. IS-2000 Releases 0 and Aare commonly referred to as CDMA2000 1X, 1X, etc. IS-856 (TIA-856) iscommonly referred to as CDMA2000 1xEV-DO, High Rate Packet Data (HRPD),etc. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. ATDMA system may implement a radio technology such as Global System forMobile Communications (GSM). An OFDMA system may implement a radiotechnology such as Ultra Mobile Broadband (UMB), Evolved UTRA (E-UTRA),IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM™, etc.UTRA and E-UTRA are part of Universal Mobile Telecommunication System(UMTS). 3GPP Long Term Evolution (LTE) and LTE-Advanced (LTE-A) are newreleases of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, andGSM are described in documents from an organization named “3rdGeneration Partnership Project” (3GPP). CDMA2000 and UMB are describedin documents from an organization named “3rd Generation PartnershipProject 2” (3GPP2). The techniques described herein may be used for thesystems and radio technologies mentioned above as well as other systemsand radio technologies, including cellular (such as LTE) communicationsover a shared radio frequency spectrum band. The description below,however, describes an LTE/LTE-A system for purposes of example, and LTEterminology is used in much of the description below, although thetechniques are applicable beyond LTE/LTE-A applications (such as tofifth generation (5G) NR networks or other next generation communicationsystems).

The following description provides examples, and is not limiting of thescope, applicability, or examples set forth in the claims. Changes maybe made in the function and arrangement of elements discussed withoutdeparting from the scope of the disclosure. Various examples may omit,substitute, or add various procedures or components as appropriate. Forinstance, the methods described may be performed in an order differentfrom that described, and various steps may be added, omitted, orcombined. Also, features described with respect to some examples may becombined in other examples.

Various aspects or features will be presented in terms of systems thatcan include a number of devices, components, modules, and the like. Itis to be understood and appreciated that the various systems can includeadditional devices, components, modules, etc. or may not include all ofthe devices, components, modules etc. discussed in connection with thefigures. A combination of these approaches also can be used.

FIG. 1 illustrates an example of a wireless communication system. Thewireless communications system (also referred to as a wireless wide areanetwork (WWAN)), includes an access network 100, base stations 102, UEs104, an Evolved Packet Core (EPC) 160, or a 5G Core (5GC) 190. The basestations 102, which also may be referred to as network entities, mayinclude macro cells (high power cellular base station) or small cells(low power cellular base station). The macro cells can include basestations. The small cells can include femtocells, picocells, andmicrocells. In an example, the base stations 102 also may include gNBs180, as described further herein.

In one example, some nodes such as base station 102/gNB 180, may have amodem 240 and communicating component 242 for determining andtransmitting CSI setting configuration information to a UE and receivinga CSI report along with a distinct DMRS pattern indicating a repetitiousor non-repetitious CSI report transmission setting, as described herein.Though a base station 102/gNB 180 is shown as having the modem 240 andcommunicating component 242, this is one illustrative example, andsubstantially any node may include a modem 240 and communicatingcomponent 242 for providing corresponding functionalities describedherein.

In another example, some nodes such as UE 104 of the wirelesscommunication system may have a modem 340 and communicating component342 for indicating selection of a CSI report setting option (i.e.,repetitious or non-repetitious CSI report transmission setting) by adistinct DMRS pattern, as described herein. Though a UE 104 is shown ashaving the modem 340 and communicating component 342, this is oneillustrative example, and substantially any node or type of node mayinclude a modem 340 and communicating component 342 for providingcorresponding functionalities described herein.

The base stations 102 configured for 4G LTE (which can collectively bereferred to as Evolved Universal Mobile Telecommunications System (UMTS)Terrestrial Radio Access Network (E-UTRAN)) may interface with the EPC160 through backhaul links 132 (such as using an Si interface). The basestations 102 configured for 5G NR (which can collectively be referred toas Next Generation RAN (NG-RAN)) may interface with 5GC 190 throughbackhaul links 184. In addition to other functions, the base stations102 may perform one or more of the following functions: transfer of userdata, radio channel ciphering and deciphering, integrity protection,header compression, mobility control functions (such as handover, dualconnectivity), inter-cell interference coordination, connection setupand release, load balancing, distribution for non-access stratum (NAS)messages, NAS node selection, synchronization, radio access network(RAN) sharing, multimedia broadcast multicast service (MBMS), subscriberand equipment trace, RAN information management (RIM), paging,positioning, and delivery of warning messages. The base stations 102 maycommunicate directly or indirectly (such as through the EPC 160 or 5GC190) with each other over backhaul links 134 (such as using an X2interface). The backhaul links 132, 134 or 184 may be wired or wireless.

The base stations 102 may wirelessly communicate with one or more UEs104. Each of the base stations 102 may provide communication coveragefor a respective geographic coverage area 110. There may be overlappinggeographic coverage areas 110. For example, the small cell 102′ may havea coverage area 110′ that overlaps the coverage area 110 of one or moremacro base stations 102. A network that includes both small cell andmacro cells may be referred to as a heterogeneous network. Aheterogeneous network also may include Home Evolved Node Bs (eNBs)(HeNBs), which may provide service to a restricted group, which can bereferred to as a closed subscriber group (CSG). The communication links120 between the base stations 102 and the UEs 104 may include uplink(UL) (also referred to as reverse link) transmissions from a UE 104 to abase station 102 or downlink (DL) (also referred to as forward link)transmissions from a base station 102 to a UE 104. The communicationlinks 120 may use multiple-input and multiple-output (MIMO) antennatechnology, including spatial multiplexing, beamforming, or transmitdiversity. The communication links may be through one or more carriers.The base stations 102/UEs 104 may use spectrum up to Y MHz (such as 5,10, 15, 20, 100, 400, etc. MHz) bandwidth per carrier allocated in acarrier aggregation of up to a total of Yx MHz (such as for x componentcarriers) used for transmission in the DL or the UL direction. Thecarriers may or may not be adjacent to each other. Allocation ofcarriers may be asymmetric with respect to DL and UL (such as more orless carriers may be allocated for DL than for UL). The componentcarriers may include a primary component carrier and one or moresecondary component carriers. A primary component carrier may bereferred to as a primary cell (PCell) and a secondary component carriermay be referred to as a secondary cell (SCell).

In another example, certain UEs 104 may communicate with each otherusing device-to-device (D2D) communication link 158. The D2Dcommunication link 158 may use the DL/UL WWAN spectrum. The D2Dcommunication link 158 may use one or more sidelink channels, such as aphysical sidelink broadcast channel (PSBCH), a physical sidelinkdiscovery channel (PSDCH), a physical sidelink shared channel (PSSCH),and a physical sidelink control channel (PSCCH). D2D communication maybe through a variety of wireless D2D communications systems, such as forexample, FlashLinQ, WiMedia, Bluetooth, ZigBee, Wi-Fi based on the IEEE802.11 standard, LTE, or NR.

The wireless communications system may further include a Wi-Fi accesspoint (AP) 150 in communication with Wi-Fi stations (STAs) 152 viacommunication links 154 in a 5 GHz unlicensed frequency spectrum. Whencommunicating in an unlicensed frequency spectrum, the STAs 152/AP 150may perform a clear channel assessment (CCA) prior to communicating inorder to determine whether the channel is available.

The small cell 102′ may operate in a licensed or an unlicensed frequencyspectrum. When operating in an unlicensed frequency spectrum, the smallcell 102′ may employ NR and use the same 5 GHz unlicensed frequencyspectrum as used by the Wi-Fi AP 150. The small cell 102′, employing NRin an unlicensed frequency spectrum, may boost coverage to or increasecapacity of the access network.

A base station 102, whether a small cell 102′ or a large cell (such asmacro base station), may include an eNB, gNodeB (gNB), or other type ofbase station. Some base stations, such as gNB 180 may operate in atraditional sub 6 GHz spectrum, in millimeter wave (mmW) frequencies, ornear mmW frequencies in communication with the UE 104. When the gNB 180operates in mmW or near mmW frequencies, the gNB 180 may be referred toas an mmW base station. Extremely high frequency (EHF) is part of the RFin the electromagnetic spectrum. EHF has a range of 30 GHz to 300 GHzand a wavelength between 1 millimeter and 10 millimeters. Radio waves inthe band may be referred to as a millimeter wave. Near mmW may extenddown to a frequency of 3 GHz with a wavelength of 100 millimeters. Thesuper high frequency (SHF) band extends between 3 GHz and 30 GHz, alsoreferred to as centimeter wave. Communications using the mmW/near mmWradio frequency band has extremely high path loss and a short range. ThemmW base station, which may correspond to gNB 180, may utilizebeamforming 182 with the UE 104 to compensate for the extremely highpath loss and short range. A base station 102 referred to herein caninclude a gNB 180.

The EPC 160 may include a Mobility Management Entity (MME) 162, otherMMEs 164, a Serving Gateway 166, a Multimedia Broadcast MulticastService (MBMS) Gateway 168, a Broadcast Multicast Service Center (BM-SC)170, and a Packet Data Network (PDN) Gateway 172. The MME 162 may be incommunication with a Home Subscriber Server (HSS) 174. The MME 162 isthe control node that processes the signaling between the UEs 104 andthe EPC 160. Generally, the MME 162 provides bearer and connectionmanagement. All user Internet protocol (IP) packets are transferredthrough the Serving Gateway 166, which itself is connected to the PDNGateway 172. The PDN Gateway 172 provides UE IP address allocation aswell as other functions. The PDN Gateway 172 and the BM-SC 170 areconnected to the IP Services 176. The IP Services 176 may include theInternet, an intranet, an IP Multimedia Subsystem (IMS), a PS StreamingService, or other IP services. The BM-SC 170 may provide functions forMBMS user service provisioning and delivery. The BM-SC 170 may serve asan entry point for content provider MBMS transmission, may be used toauthorize and initiate MBMS Bearer Services within a public land mobilenetwork (PLMN), and may be used to schedule MBMS transmissions. The MBMSGateway 168 may be used to distribute MBMS traffic to the base stations102 belonging to a Multicast Broadcast Single Frequency Network (MBSFN)area broadcasting a particular service, and may be responsible forsession management (start/stop) and for collecting eMBMS relatedcharging information.

The 5GC 190 may include a Access and Mobility Management Function (AMF)192, other AMFs 193, a Session Management Function (SMF) 194, and a UserPlane Function (UPF) 195. The AMF 192 may be in communication with aUnified Data Management (UDM) 196. The AMF 192 can be a control nodethat processes the signaling between the UEs 104 and the 5GC 190.Generally, the AMF 192 can provide QoS flow and session management. UserInternet protocol (IP) packets (such as from one or more UEs 104) can betransferred through the UPF 195. The UPF 195 can provide UE IP addressallocation for one or more UEs, as well as other functions. The UPF 195is connected to the IP Services 197. The IP Services 197 may include theInternet, an intranet, an IP Multimedia Subsystem (IMS), a PS StreamingService, or other IP services.

The base station also may be referred to as a gNB, Node B, evolved NodeB (eNB), an access point, a base transceiver station, a radio basestation, a radio transceiver, a transceiver function, a basic serviceset (BSS), an extended service set (ESS), a transmit reception point(TRP), or some other suitable terminology. The base station 102 providesan access point to the EPC 160 or 5GC 190 for a UE 104. Examples of UEs104 include a cellular phone, a smart phone, a session initiationprotocol (SIP) phone, a laptop, a personal digital assistant (PDA), asatellite radio, a positioning system (such as satellite, terrestrial),a multimedia device, a video device, a digital audio player (such as MP3player), a camera, a game console, a tablet, a smart device, robots,drones, an industrial/manufacturing device, a wearable device (such as asmart watch, smart clothing, smart glasses, virtual reality goggles, asmart wristband, smart jewelry (such as a smart ring, a smartbracelet)), a vehicle/a vehicular device, a meter (such as parkingmeter, electric meter, gas meter, water meter, flow meter), a gas pump,a large or small kitchen appliance, a medical/healthcare device, animplant, a sensor/actuator, a display, or any other similar functioningdevice. Some of the UEs 104 may be referred to as IoT devices (such asmeters, pumps, monitors, cameras, industrial/manufacturing devices,appliances, vehicles, robots, drones, etc.). IoT UEs may includeMTC/enhanced MTC (eMTC, also referred to as CAT-M, Cat M1) UEs, NB-IoT(also referred to as CAT NB1) UEs, as well as other types of UEs. In thepresent disclosure, eMTC and NB-IoT may refer to future technologiesthat may evolve from or may be based on these technologies. For example,eMTC may include FeMTC (further eMTC), eFeMTC (enhanced further eMTC),mMTC (massive MTC), etc., and NB-IoT may include eNB-IoT (enhancedNB-IoT), FeNB-IoT (further enhanced NB-IoT), etc. The UE 104 also may bereferred to as a station, a mobile station, a subscriber station, amobile unit, a subscriber unit, a wireless unit, a remote unit, a mobiledevice, a wireless device, a wireless communications device, a remotedevice, a mobile subscriber station, an access terminal, a mobileterminal, a wireless terminal, a remote terminal, a handset, a useragent, a mobile client, a client, or some other suitable terminology.

Turning now to FIGS. 2-7, aspects are depicted with reference to one ormore components and one or more methods that may perform the actions oroperations described herein, where aspects in dashed line may beoptional. Although the operations described below in FIGS. 5 and 6 arepresented in a particular order or as being performed by an examplecomponent, it should be understood that the ordering of the actions andthe components performing the actions may be varied, depending on theaspect. Moreover, it should be understood that the following actions,functions, or described components may be performed by aspecially-programmed processor, a processor executingspecially-programmed software or computer-readable media, or by anyother combination of a hardware component or a software componentcapable of performing the described actions or functions.

FIG. 2 is a block diagram illustrating an example of a network entity(also referred to as a base station). The base station 102 (such as abase station 102 or gNB 180, as described above) may include a varietyof components, some of which have already been described above and aredescribed further herein, including components such as one or moreprocessors 212 and memory 216 and transceiver 202 in communication viaone or more buses 244, which may operate in conjunction with modem 240or communicating component 242 for determining and transmitting CSIsetting configuration information to a UE and receiving a CSI reportalong with a distinct DMRS pattern indicating a repetitious ornon-repetitious CSI report transmission setting.

In some aspects, the one or more processors 212 can include a modem 240or can be part of the modem 240 that uses one or more modem processors.Thus, the various functions related to communicating component 242 maybe included in modem 240 or processors 212 and, in some aspects, can beexecuted by a single processor, while in other aspects, different onesof the functions may be executed by a combination of two or moredifferent processors. For example, in some aspects, the one or moreprocessors 212 may include any one or any combination of a modemprocessor, or a baseband processor, or a digital signal processor, or atransmit processor, or a receiver processor, or a transceiver processorassociated with transceiver 202. In other aspects, some of the featuresof the one or more processors 212 or modem 240 associated withcommunicating component 242 may be performed by transceiver 202.

Also, memory 216 may be configured to store data used herein or localversions of applications 275 or communicating component 242 or one ormore of its subcomponents being executed by at least one processor 212.Memory 216 can include any type of computer-readable medium usable by acomputer or at least one processor 212, such as random access memory(RAM), read only memory (ROM), tapes, magnetic discs, optical discs,volatile memory, non-volatile memory, and any combination thereof. Insome aspects, for example, memory 216 may be a non-transitorycomputer-readable storage medium that stores one or morecomputer-executable codes defining communicating component 242 or one ormore of its subcomponents, or data associated therewith, when basestation 102 is operating at least one processor 212 to executecommunicating component 242 or one or more of its subcomponents.

Transceiver 202 may include at least one receiver 206 and at least onetransmitter 208. Receiver 206 may include hardware or softwareexecutable by a processor for receiving data, the code includinginstructions and being stored in a memory (such as computer-readablemedium). Receiver 206 may be, for example, a radio frequency (RF)receiver. In some aspects, receiver 206 may receive signals transmittedby at least one base station 102. Additionally, receiver 206 may processsuch received signals, and also may obtain measurements of the signals,such as, but not limited to, Ec/Io, signal-to-noise ratio (SNR),reference signal received power (RSRP), received signal strengthindicator (RSSI), etc. Transmitter 208 may include hardware or softwareexecutable by a processor for transmitting data, the code includinginstructions and being stored in a memory (such as computer-readablemedium). A suitable example of transmitter 208 may including, but is notlimited to, an RF transmitter.

Moreover, in some aspects, base station 102 may include RF front end288, which may operate in communication with one or more antennas 265and transceiver 202 for receiving and transmitting radio transmissions,for example, wireless communications transmitted by at least one basestation 102 or wireless transmissions transmitted by UE 104. RF frontend 288 may be connected to one or more antennas 265 and can include oneor more low-noise amplifiers (LNAs) 290, one or more switches 292, oneor more power amplifiers (PAs) 298, and one or more filters 296 fortransmitting and receiving RF signals. The antennas 265 may include oneor more antennas, antenna elements, or antenna arrays.

In some aspects, LNA 290 can amplify a received signal at a desiredoutput level. In some aspects, each LNA 290 may have a specified minimumand maximum gain values. In some aspects, RF front end 288 may use oneor more switches 292 to select a particular LNA 290 and its specifiedgain value based on a desired gain value for a particular application.

Further, for example, one or more PA(s) 298 may be used by RF front end288 to amplify a signal for an RF output at a desired output powerlevel. In some aspects, each PA 298 may have specified minimum andmaximum gain values. In some aspects, RF front end 288 may use one ormore switches 292 to select a particular PA 298 and its specified gainvalue based on a desired gain value for a particular application.

Also, for example, one or more filters 296 can be used by RF front end288 to filter a received signal to obtain an input RF signal. Similarly,in some aspects, for example, a respective filter 296 can be used tofilter an output from a respective PA 298 to produce an output signalfor transmission. In some aspects, each filter 296 can be connected to aspecific LNA 290 or PA 298. In some aspects, RF front end 288 can useone or more switches 292 to select a transmit or receive path using aspecified filter 296, LNA 290, or PA 298, based on a configuration asspecified by transceiver 202 or processor 212.

As such, transceiver 202 may be configured to transmit and receivewireless signals through one or more antennas 265 via RF front end 288.In some aspects, transceiver may be tuned to operate at specifiedfrequencies such that UE 104 can communicate with, for example, one ormore base stations 102 or one or more cells associated with one or morebase stations 102. In some aspects, for example, modem 240 can configuretransceiver 202 to operate at a specified frequency and power levelbased on the UE configuration of the UE 104 and the communicationprotocol used by modem 240.

In some aspects, modem 240 can be a multiband-multimode modem, which canprocess digital data and communicate with transceiver 202 such that thedigital data is sent and received using transceiver 202. In someaspects, modem 240 can be multiband and be configured to supportmultiple frequency bands for a specific communications protocol. In someaspects, modem 240 can be multimode and be configured to supportmultiple operating networks and communications protocols. In someaspects, modem 240 can control one or more components of UE 104 (such asRF front end 288, transceiver 202) to enable transmission or receptionof signals from the network based on a specified modem configuration. Insome aspects, the modem configuration can be based on the mode of themodem and the frequency band in use. In another aspect, the modemconfiguration can be based on UE configuration information associatedwith UE 104 as provided by the network during cell selection or cellreselection.

In some aspects, the processor(s) 212 may correspond to one or more ofthe processors described in connection with the UE in FIGS. 4 and 6.Similarly, the memory 216 may correspond to the memory described inconnection with the UE in FIG. 7.

FIG. 3 is a block diagram illustrating an example of a UE 104. The UE104 may include a variety of components, some of which have already beendescribed above and are described further herein, including componentssuch as one or more processors 312 and memory 316 and transceiver 302 incommunication via one or more buses 344, which may operate inconjunction with modem 340 or communicating component 342 configured toindicate selection of a CSI report setting option (i.e., repetitious ornon-repetitious CSI report transmission setting) by a distinct DMRSpattern.

The transceiver 302, receiver 306, transmitter 308, one or moreprocessors 312, memory 316, applications 375, buses 344, RF front end388, LNAs 390, switches 392, filters 396, PAs 398, and one or moreantennas 365 may be the same as or similar to the correspondingcomponents of base station 102, as described above, but configured orotherwise programmed for base station operations as opposed to basestation operations.

In some aspects, the processor(s) 312 may correspond to one or more ofthe processors described in connection with the base station in FIG. 7.Similarly, the memory 316 may correspond to the memory described inconnection with the base station in FIG. 7.

FIG. 4 is an example representation of a CSI report 400. Specifically,reliability of a CSI report (i.e., Layer 1 reference signal receivedpower (L1-RSRP) and Layer 1 signal-to-noise ratio (L1-SINR)) may beimportant for beam reliability for unicast coverage in frequency range 2(FR2). For example, CSI in NR may include a channel quality indicator(CQI), precoding matrix indicator (PMI), CSI-RS resource indicator(CRI), strongest layer indication (SLI), rank indication (RI), L1-RSRP(i.e., for beam management), and/or L1-SINR (i.e., also for beammanagement). In some aspects, an L1-RSRP or L1-SINR report may be large(i.e., about 20 bits), which may result in poor coverage or transmissionof the reports via a physical uplink control channel (PUCCH).

Different types of CSI reporting may include periodic, semi-persistent,and aperiodic. Periodic CSI reporting may be carried or transmitted on ashort PUCCH or long PUCCH. Semi-persistent (SP) CSI reporting may becarried or transmitted on a long PUCCH or physical uplink shared channel(PUSCH). The resources and/or modulation and coding scheme (MCS) forSP-CSI on PUSCH may be allocated semi-persistently using downlinkcontrol information (DCI). Further, SP-CSI may support Type II CSI withminimum periodicity of 5 ms. Additionally, SP-CSI reporting may not besupported for aperiodic CSI-RS transmissions. In some aspects, one CSIreport carried by or transmitted on multiple uplink reporting instancesmay not be precluded. Aperiodic CSI reporting may be carried ortransmitted on a PUSCH multiplexed with or without uplink data. Periodicor SP-CSI reporting may support a number of periodicities (i.e., 5, 10,20, 40, 80, 160, 320 slots).

In some aspects, L1-SINR may be used for beam selection by taking intoaccount interference (e.g., with similar format as L1-RSRP). Forexample, up to four beams may be reported per configured report. Anabsolute SINR value may be reported for the first reported beam, whichhas a highest SINR. A differential SINR value may be reported perremaining beam (i.e., differential SINR may be computed with respect tothe highest SINR). As shown, the CSI report 400 may include a CSI reportnumber 402 and a number of CSI fields 404. The CSI fields 404 mayinclude a CRI or synchronization signal block resource indicator(SSBRI), an SINR, and a differential SINR. However, transmissions of CSIreports may suffer from poor PUCCH transmissions when of a larger size.Further, the network may not be aware of a type of CSI reporting (e.g.,periodic, semi-persistent, or aperiodic).

As such, to improve the reliability of beam management for unicastchannels (i.e., PUCCH), an indication of a selection of a CSI reportsetting option by a DMRS pattern is disclosed herein.

Specifically, a selection of a CSI report by a UE may be indicated by aDMRS pattern. That is, two or more configured report settings e.g., withand without repetition, may be dynamically selected by a UE based on anumber of measurements (e.g., RSRP or SINR), and indicated by a distinctDMRS pattern on a default (i.e., original) transmission of the CSIreport (e.g., for blind detection by a gNB). The UE may determinewhether coverage enhancement for configured CSI reporting is warrantedby implementing a transmission periodicity for a CSI report andindicating such to the network entity as a DMRS pattern unique to thetransmission periodicity (e.g., periodic or semi-persistent). That is,the coverage-enhanced CSI reporting may implement repetitioustransmissions of a CSI report (e.g., as opposed to a default single CSItransmission). The specific repetitious transmissions, or reportingtype, may be indicated using a DMRS pattern associated with the specificreporting type (e.g., periodic or semi-persistent). More specifically,the UE may select one set of parameters for the CSI report among twosets of parameters that may be already configured for the UE.

To aid the network, the UE may, as part of a first transmission of theCSI report, also transmit a distinct DMRS pattern associated with thedetermined periodic or semi-persistent transmission. For example, the UEmay determine that due to channel conditions falling below asatisfactory threshold based on one or more measurements (e.g., SINR orRSRP), a periodic transmission of the CSI report may be warranted. Toinform the network, the UE may transmit a first DMRS pattern associatedwith or otherwise indicating the periodic transmissions to the networkentity. The network entity, having previously configured the UE for suchDMRS pattern transmissions, and the specific DMRS pattern associationsto the CSI reporting types (e.g., periodic or semi-persistent), maydetermine a type of CSI reporting in response to the receiving the DMRSpattern from the UE.

In some aspects, a configured gap may exist between the defaulttransmission and an additional transmission as the network entity (e.g.,gNB) may prepare a reservation of a spatial reception. Further, a set ofmultiple associated DMRS patterns for a CSI report and/or acorrespondence of DMRS pattern to additional CSI report transmissionsmay be indicated in a configuration of a periodic CSI report or asemi-persistent CSI report. For a semi-persistent CSI report,correspondence of a DMRS pattern to an additional transmission of CSIreport and/or the option of additional transmissions of CSI report(e.g., depending on DMRS pattern) may be determined by a the DCI thatactivates the CSI report. The criteria for selecting additional CSIreport transmissions by UE may be configured by the network entity(e.g., gNB) in the CSI report setting configuration. For example, thecriteria may include rules based on UE measurements (e.g. LLR quality,L1-RSRP or L1-SINR) or some statistics (e.g., means, median, or afunction of previous measurement) based on UE measurements.

FIG. 5 is a flowchart of an example method 500 of wireless communicationat an apparatus of a UE. In an example, a UE 104 can perform thefunctions described in method 500 using one or more of the componentsdescribed in FIGS. 1, 3 and 7.

At block 502, the method 500 may obtain at least one measurement of acommunication channel associated with a network entity. In some aspects,the communicating component 342, such as in conjunction withprocessor(s) 312, memory 316, or transceiver 302, may be configured toobtain at least one measurement of a communication channel associatedwith a network entity. Thus, the UE 104, the processor(s) 312, thecommunicating component 342 or one of its subcomponents may define themeans for obtaining at least one measurement of a communication channelassociated with a network entity. For example, the processor 312 of theUE 104 may activate the transceiver 302 and associated RF front end 388components to obtain at least one measurement of a communicationchannel.

In some aspects, the at least one measurement corresponds to a downlinkreception quality indicator, an RSRP, or an SINR.

At block 504, the method 500 may determine a CSI transmission settingbased on the at least one measurement of the communication channel, theCSI transmission setting is associated with a distinct DMRS pattern. Insome aspects, the communicating component 342, such as in conjunctionwith processor(s) 312, memory 316, or transceiver 302, may be configuredto determine a CSI transmission setting based on the at least onemeasurement of the communication channel, the CSI transmission settingis associated with a distinct DMRS pattern. Thus, the UE 104, theprocessor(s) 312, the communicating component 342 or one of itssubcomponents may define the means for determining a CSI transmissionsetting based on the at least one measurement of the communicationchannel, the CSI transmission setting is associated with a distinct DMRSpattern. For example, the processor 312 of the UE 104 may, inconjunction with one or more applications 375 residing at the memory316, identify a CSI transmission setting based on the obtainedmeasurement.

In some aspects, the CSI transmission setting may correspond to one of arepetitious CSI transmission setting or a non-repetitious CSItransmission setting.

In some aspects, the repetitious CSI transmission setting may correspondto a periodic CSI transmission and the non-repetitious CSI transmissionsetting corresponds to a semi-persistent CSI transmission.

In some aspects, the repetitious CSI transmission setting may beassociated with a first DMRS pattern and the non-repetitious CSItransmission setting may be associated with a second DMRS pattern.

At block 506, the method 500 may transmit a CSI report with the distinctDMRS pattern to the network entity in accordance with the CSItransmission setting. In some aspects, the communicating component 342,such as in conjunction with processor(s) 312, memory 316, or transceiver302, may be configured to transmit a CSI report with the distinct DMRSpattern to the network entity in accordance with the CSI transmissionsetting. Thus, the UE 104, the processor(s) 312, the communicatingcomponent 342 or one of its subcomponents may define the means fortransmitting a CSI report with the distinct DMRS pattern to the networkentity in accordance with the CSI transmission setting. For instance, totransmit the CSI report, the processor 312 of the UE 104 may activatethe transceiver 302 and associated RF front end 388 components.

In some aspects, the method 500 may further include receiving DCI thatactivates the CSI report associated with the semi-persistent CSItransmission, and determining one or both of an option for a subsequenttransmission of the CSI report or a correspondence of the distinct DMRSpattern to the subsequent transmission of the CSI report based on theDCI. In some aspects, the communicating component 342, such as inconjunction with processor(s) 312, memory 316, or transceiver 302, maybe configured to receive DCI that activates the CSI report associatedwith the semi-persistent CSI transmission, and determine one or both ofan option for a subsequent transmission of the CSI report or acorrespondence of the distinct DMRS pattern to the subsequenttransmission of the CSI report based on the DCI. Thus, the UE 104, theprocessor(s) 312, the communicating component 342 or one of itssubcomponents may define the means for receiving DCI that activates theCSI report associated with the semi-persistent CSI transmission, andmeans for determining one or both of an option for a subsequenttransmission of the CSI report or a correspondence of the distinct DMRSpattern to the subsequent transmission of the CSI report based on theDCI.

In some aspects, transmitting the distinct DMRS pattern may includetransmitting the first DMRS pattern based on determining that the CSItransmission setting corresponds to the repetitious CSI transmissionsetting, and transmitting the second DMRS pattern based on determiningthat the CSI transmission setting corresponds to the non-repetitious CSItransmission setting.

In some aspects, the method 500 may further include determining that anon-transmission period has elapsed after transmitting the CSI report,the non-transmission period permits reservation of spatial resources forreception by the network entity, and transmitting a subsequent CSIreport based on determining that the non-transmission period haselapsed. In some aspects, the communicating component 342, such as inconjunction with processor(s) 312, memory 316, or transceiver 302, maybe configured to determine that a non-transmission period has elapsedafter transmitting the CSI report, the non-transmission period permitsreservation of spatial resources for reception by the network entity,and transmit a subsequent CSI report based on determining that thenon-transmission period has elapsed. Thus, the UE 104, the processor(s)312, the communicating component 342 or one of its subcomponents maydefine the means for determining that a non-transmission period haselapsed after transmitting the CSI report, the non-transmission periodpermits reservation of spatial resources for reception by the networkentity, and means for transmitting a subsequent CSI report based ondetermining that the non-transmission period has elapsed.

In some aspects, the method 500 may further include receiving CSI reportconfiguration information from the network entity including at least oneof a set of multiple associated DMRS patterns for the CSI report, or acorrespondence of the DMRS pattern to a subsequent CSI reporttransmission. In some aspects, the communicating component 342, such asin conjunction with processor(s) 312, memory 316, or transceiver 302,may be configured to receive CSI report configuration information fromthe network entity including at least one of a set of multipleassociated DMRS patterns for the CSI report, or a correspondence of theDMRS pattern to a subsequent CSI report transmission. Thus, the UE 104,the processor(s) 312, the communicating component 342 or one of itssubcomponents may define the means for receiving CSI reportconfiguration information from the network entity including at least oneof a set of multiple associated DMRS patterns for the CSI report, or acorrespondence of the DMRS pattern to a subsequent CSI reporttransmission.

In some aspects, the method 500 may further include receiving CSI reportsetting configuration information including criteria for selecting theCSI transmission setting, the criteria includes at least one parametercorresponding to a channel measurement threshold that triggers selectionof the distinct DMRS pattern.

FIG. 6 is a flowchart of an example method 600 of wireless communicationat a network entity. In an example, a base station 102 can perform thefunctions described in method 600 using one or more of the componentsdescribed in FIGS. 1, 2 and 7.

At block 602, the method 600 may transmit CSI setting configurationinformation to a UE, the CSI setting configuration information includingat least one parameter corresponding to a channel measurement thresholdthat triggers selection of a distinct DMRS pattern based on a CSItransmission setting. In some aspects, the communicating component 242,such as in conjunction with processor(s) 212, memory 216, or transceiver202, may be configured to transmit CSI setting configuration informationto a UE, the CSI setting configuration information including at leastone parameter corresponding to a channel measurement threshold thattriggers selection of a distinct DMRS pattern based on a CSItransmission setting. Thus, the base station 102, the processor(s) 212,the communicating component 242 or one of its subcomponents may definethe means for transmitting CSI setting configuration information to aUE, the CSI setting configuration information including at least oneparameter corresponding to a channel measurement threshold that triggersselection of a distinct DMRS pattern based on a CSI transmissionsetting. For example, to transmit the CSI setting configurationinformation to the UE 104, the processor 212 of the base station 102 mayactivate the transceiver 202 and associated RF front end 288 components.

In some aspects, the CSI transmission setting may correspond to one of arepetitious CSI transmission setting or a non-repetitious CSItransmission setting.

In some aspects, the repetitious CSI transmission setting corresponds toa periodic CSI transmission and the non-repetitious CSI transmissionsetting corresponds to a semi-persistent CSI transmission.

In some aspects, the repetitious CSI transmission setting may beassociated with a first DMRS pattern and the non-repetitious CSItransmission may be associated with a second DMRS pattern.

In some aspects, the CSI report configuration information may furtherinclude at least one of a set of multiple associated DMRS patterns forthe CSI report, or a correspondence of the DMRS pattern to a subsequentCSI report transmission.

At block 604, the method 600 may receive a CSI report and the distinctDMRS pattern from the UE associated with the CSI transmission setting.In some aspects, the communicating component 242, such as in conjunctionwith processor(s) 212, memory 216, or transceiver 202, may be configuredto receive a CSI report and the distinct DMRS pattern from the UEassociated with the CSI transmission setting. Thus, the base station102, the processor(s) 212, the communicating component 242 or one of itssubcomponents may define the means for receiving a CSI report and thedistinct DMRS pattern from the UE associated with the CSI transmissionsetting. For example, to receive the CSO report and DMRS pattern, theprocessor 212 of the base station 102 may activate the transceiver 202and associated RF front end 288 components.

In some aspects, the method 500 may further include transmitting DCIthat activates the CSI report associated with the semi-persistent CSItransmission. In some aspects, the communicating component 242, such asin conjunction with processor(s) 212, memory 216, or transceiver 202,may be configured to transmit DCI that activates the CSI reportassociated with the semi-persistent CSI transmission. Thus, the basestation 102, the processor(s) 212, the communicating component 242 orone of its subcomponents may define the means for transmitting DCI thatactivates the CSI report associated with the semi-persistent CSItransmission.

In some aspects, the method 500 may further include determining whetherthe distinct DMRS pattern corresponds to the DMRS pattern or the secondDMRS pattern, identifying the repetitious CSI transmission setting basedon determining that the distinct DMRS pattern as the first DMRS pattern,and identifying the non-repetitious CSI transmission setting based ondetermining that the distinct DMRS pattern as the second DMRS pattern.In some aspects, the communicating component 242, such as in conjunctionwith processor(s) 212, memory 216, or transceiver 202, may be configuredto determine whether the distinct DMRS pattern corresponds to the DMRSpattern or the second DMRS pattern, identify the repetitious CSItransmission setting based on determining that the distinct DMRS patternas the first DMRS pattern, and identify the non-repetitious CSItransmission setting based on determining that the distinct DMRS patternas the second DMRS pattern. Thus, the base station 102, the processor(s)212, the communicating component 242 or one of its subcomponents maydefine the means for determining whether the distinct DMRS patterncorresponds to the DMRS pattern or the second DMRS pattern, means foridentifying the repetitious CSI transmission setting based ondetermining that the distinct DMRS pattern as the first DMRS pattern,and means for identifying the non-repetitious CSI transmission settingbased on determining that the distinct DMRS pattern as the second DMRSpattern

FIG. 7 is a block diagram of a MIMO communication system 700 including abase station 102 and a UE 104. The MIMO communication system 700 may beconfigured to indicate selection of a CSI report setting option (i.e.,repetitious or non-repetitious CSI report transmission setting) by adistinct DMRS pattern, as described herein. The MIMO communicationsystem 700 may illustrate aspects of the wireless communication accessnetwork 100 described with reference to FIG. 1. The base station 102 maybe an example of aspects of the base station 102 described withreference to FIG. 1. The base station 102 may be equipped with antennas734 and 735, and the UE 104 may be equipped with antennas 752 and 753.In the MIMO communication system 700, the base station 102 may be ableto send data over multiple communication links at the same time. Eachcommunication link may be called a “layer” and the “rank” of thecommunication link may indicate the number of layers used forcommunication. For example, in a 2×2 MIMO communication system wherebase station 102 transmits two “layers,” the rank of the communicationlink between the base station 102 and the UE 104 is two.

At the base station 102, a transmit (Tx) processor 720 may receive datafrom a data source. The transmit processor 720 may process the data. Thetransmit processor 720 also may generate control symbols or referencesymbols. A transmit MIMO processor 730 may perform spatial processing(such as precoding) on data symbols, control symbols, or referencesymbols, if applicable, and may provide output symbol streams to thetransmit modulator/demodulators 732 and 733. Each modulator/demodulator732 through 733 may process a respective output symbol stream (such asfor OFDM, etc.) to obtain an output sample stream. Eachmodulator/demodulator 732 through 733 may further process (such asconvert to analog, amplify, filter, and upconvert) the output samplestream to obtain a DL signal. In one example, DL signals frommodulator/demodulators 732 and 733 may be transmitted via the antennas734 and 735, respectively.

The UE 104 may be an example of aspects of the UEs 104 described withreference to FIGS. 1 and 2. At the UE 104, the UE antennas 752 and 753may receive the DL signals from the base station 102 and may provide thereceived signals to the modulator/demodulators 754 and 755,respectively. Each modulator/demodulator 754 through 755 may condition(such as filter, amplify, downconvert, and digitize) a respectivereceived signal to obtain input samples. Each modulator/demodulator 754through 755 may further process the input samples (such as for OFDM,etc.) to obtain received symbols. A MIMO detector 756 may obtainreceived symbols from the modulator/demodulators 754 and 755, performMIMO detection on the received symbols, if applicable, and providedetected symbols. A receive (Rx) processor 758 may process (such asdemodulate, deinterleave, and decode) the detected symbols, providingdecoded data for the UE 104 to a data output, and provide decodedcontrol information to a processor 780, or memory 782.

The processor 780 may in some cases execute stored instructions toinstantiate a communicating component 242 (see such as FIGS. 1 and 2).

On the uplink (UL), at the UE 104, a transmit processor 764 may receiveand process data from a data source. The transmit processor 764 also maygenerate reference symbols for a reference signal. The symbols from thetransmit processor 764 may be precoded by a transmit MIMO processor 766if applicable, further processed by the modulator/demodulators 754 and755 (such as for SC-FDMA, etc.), and be transmitted to the base station102 in accordance with the communication parameters received from thebase station 102. At the base station 102, the UL signals from the UE104 may be received by the antennas 734 and 735, processed by themodulator/demodulators 732 and 733, detected by a MIMO detector 736 ifapplicable, and further processed by a receive processor 738. Thereceive processor 738 may provide decoded data to a data output and tothe processor 740 or memory 742.

The components of the UE 104 may, individually or collectively, beimplemented with one or more ASICs adapted to perform some or all of theapplicable functions in hardware. Each of the noted modules may be ameans for performing one or more functions related to operation of theMIMO communication system 700. Similarly, the components of the basestation 102 may, individually or collectively, be implemented with oneor more ASICs adapted to perform some or all of the applicable functionsin hardware. Each of the noted components may be a means for performingone or more functions related to operation of the MIMO communicationsystem 700.

Some Additional Examples

The aspects described herein additionally include one or more of thefollowing implementation examples described in the following numberedclauses.

1. A method of wireless communication at a user equipment (UE),comprising:

-   obtaining at least one measurement of a communication channel    associated with a network entity;-   determining a channel state information (CSI) transmission setting    based on the at least one measurement of the communication channel,    wherein the CSI transmission setting is associated with a distinct    demodulation reference signal (DMRS) pattern; and-   transmitting a CSI report with the distinct DMRS pattern to the    network entity in accordance with the CSI transmission setting.

2. The method clause claim 1, wherein the CSI transmission settingcorresponds to one of a repetitious CSI transmission setting or anon-repetitious CSI transmission setting.

3. The method of any preceding clause, wherein the repetitious CSItransmission setting corresponds to a periodic CSI transmission and thenon-repetitious CSI transmission setting corresponds to asemi-persistent CSI transmission

4. The method of any preceding clause, further comprising:

-   receiving downlink control information (DCI) that activates the CSI    report associated with the semi-persistent CSI transmission; and-   determining one or both of an option for a subsequent transmission    of the CSI report or a correspondence of the distinct DMRS pattern    to the subsequent transmission of the CSI report based on the DCI.

5. The method of any preceding clause, wherein the repetitious CSItransmission setting is associated with a first DMRS pattern and thenon-repetitious CSI transmission setting is associated with a secondDMRS pattern, and wherein transmitting the distinct DMRS patternincludes:

-   transmitting the first DMRS pattern based on determining that the    CSI transmission setting corresponds to the repetitious CSI    transmission setting; and-   transmitting the second DMRS pattern based on determining that the    CSI transmission setting corresponds to the non-repetitious CSI    transmission setting.

6. The method of any preceding clause, further comprising:

-   determining that a non-transmission period has elapsed after    transmitting the CSI report, wherein the non-transmission period    permits reservation of spatial resources for reception by the    network entity; and-   transmitting a subsequent CSI report based on determining that the    non-transmission period has elapsed.

7. The method of any preceding clause, further comprising receiving CSIreport configuration information from the network entity including atleast one of:

-   a set of multiple associated DMRS patterns for the CSI report, or-   a correspondence of the distinct DMRS pattern to a subsequent CSI    report transmission.

8. The method of any preceding clause, further comprising receiving CSIreport setting configuration information including criteria forselecting the CSI transmission setting, wherein the criteria includes atleast one parameter corresponding to a channel measurement thresholdthat triggers selection of the distinct DMRS pattern.

9. The method of any preceding clause, wherein the at least onemeasurement corresponds to:

-   a downlink reception quality indicator,-   a reference signal received power (RSRP), or-   a signal-to-interference noise ratio (SINR).

10. A method of wireless communication at a network entity, comprising:

-   transmitting channel state information (CSI) setting configuration    information to a user equipment (UE), the CSI setting configuration    information including at least one parameter corresponding to a    channel measurement threshold that triggers selection of a distinct    demodulation reference signal (DMRS) pattern based on a CSI    transmission setting; and-   receiving a CSI report and the distinct DMRS pattern from the UE    associated with the CSI transmission setting.

11. The method of any preceding clause, wherein the CSI transmissionsetting corresponds to one of a repetitious CSI transmission setting ora non-repetitious CSI transmission setting.

12. The method of any preceding clause, wherein the repetitious CSItransmission setting corresponds to a periodic CSI transmission and thenon-repetitious CSI transmission setting corresponds to asemi-persistent CSI transmission.

13. The method of any preceding clause, further comprising transmittingdownlink control information (DCI) that activates the CSI reportassociated with the semi-persistent CSI transmission.

14. The method of any preceding clause, wherein the repetitious CSItransmission setting is associated with a first DMRS pattern and thenon-repetitious CSI transmission setting is associated with a secondDMRS pattern, the method further comprising:

-   determining whether the distinct DMRS pattern corresponds to the    DMRS pattern or the second DMRS pattern;-   identifying the repetitious CSI transmission setting based on    determining that the distinct DMRS pattern as the first DMRS    pattern; and-   identifying the non-repetitious CSI transmission setting based on    determining that the distinct DMRS pattern as the second DMRS    pattern.

15. The method of any preceding clause, wherein the CSI reportconfiguration information further includes at least one of:

-   a set of multiple associated DMRS patterns for the CSI report, or-   a correspondence of the distinct DMRS pattern to a subsequent CSI    report transmission.

16. An apparatus for wireless communication, comprising:

-   a transceiver;-   a memory configured to store instructions; and-   at least one processor communicatively coupled with the transceiver    and the memory, wherein the at least one processor is configured to:    -   obtain at least one measurement of a communication channel        associated with a network entity;    -   determine a channel state information (CSI) transmission setting        based on the at least one measurement of the communication        channel, wherein the CSI transmission setting is associated with        a distinct demodulation reference signal (DMRS) pattern; and    -   transmit a CSI report with the distinct DMRS pattern to the        network entity in accordance with the CSI transmission setting.

17. The apparatus of clause 16, wherein the CSI transmission settingcorresponds to one of a repetitious CSI transmission setting or anon-repetitious CSI transmission setting.

18. The apparatus of any preceding clause, wherein the repetitious CSItransmission setting corresponds to a periodic CSI transmission and thenon-repetitious CSI transmission setting corresponds to asemi-persistent CSI transmission.

19. The apparatus of any preceding clause, wherein the at least oneprocessor is further configured to:

-   receive downlink control information (DCI) that activates the CSI    report associated with the semi-persistent CSI transmission; and-   determine one or both of an option for a subsequent transmission of    the CSI report or a correspondence of the distinct DMRS pattern to    the subsequent transmission of the CSI report based on the DCI.

20. The apparatus of any preceding clause, wherein the repetitious CSItransmission setting is associated with a first DMRS pattern and thenon-repetitious CSI transmission setting is associated with a secondDMRS pattern, and wherein to transmit the distinct DMRS pattern, the atleast one processor is further configured to:

-   transmit the first DMRS pattern based on determining that the CSI    transmission setting corresponds to the repetitious CSI transmission    setting; and-   transmit the second DMRS pattern based on determining that the CSI    transmission setting corresponds to the non-repetitious CSI    transmission setting.

21. The apparatus of any preceding clause, wherein the at least oneprocessor is further configured to:

-   determine that a non-transmission period has elapsed after    transmitting the CSI report, wherein the non-transmission period    permits reservation of spatial resources for reception by the    network entity; and-   transmit a subsequent CSI report based on determining that the    non-transmission period has elapsed.

22. The apparatus of any preceding clause, wherein the at least oneprocessor is further configured to receive CSI report configurationinformation from the network entity including at least one of:

-   a set of multiple associated DMRS patterns for the CSI report, or-   a correspondence of the distinct DMRS pattern to a subsequent CSI    report transmission.

23. The apparatus of any preceding clause, wherein the at least oneprocessor is further configured to receive CSI report settingconfiguration information including criteria for selecting the CSItransmission setting, wherein the criteria includes at least oneparameter corresponding to a channel measurement threshold that triggersselection of the distinct DMRS pattern.

24. The apparatus of any preceding clause, wherein the at least onemeasurement corresponds to:

-   a downlink reception quality indicator,-   a reference signal received power (RSRP), or-   a signal-to-interference noise ratio (SINR).

25. An apparatus for wireless communication, comprising:

-   a transceiver;-   a memory configured to store instructions; and-   at least one processor communicatively coupled with the transceiver    and the memory, wherein the at least one processor is configured to:    -   transmitting channel state information (CSI) setting        configuration information to a user equipment (UE), the CSI        setting configuration information including at least one        parameter corresponding to a channel measurement threshold that        triggers selection of a distinct demodulation reference signal        (DMRS) pattern based on a CSI transmission setting; and-   receiving a CSI report and the distinct DMRS pattern from the UE    associated with the CSI transmission setting.

26. The apparatus of clause 25, wherein the CSI transmission settingcorresponds to one of a repetitious CSI transmission setting or anon-repetitious CSI transmission setting.

27. The apparatus of any preceding clause, wherein the repetitious CSItransmission setting corresponds to a periodic CSI transmission and thenon-repetitious CSI transmission setting corresponds to asemi-persistent CSI transmission.

28. The apparatus of any preceding clause, wherein the at least oneprocessor is further configured to transmit downlink control information(DCI) that activates the CSI report associated with the semi-persistentCSI transmission.

29. The apparatus of any preceding clause, wherein the repetitious CSItransmission setting is associated with a first DMRS pattern and thenon-repetitious CSI transmission setting is associated with a secondDMRS pattern, wherein the at least one processor is further configuredto:

-   determine whether the distinct DMRS pattern corresponds to the DMRS    pattern or the second DMRS pattern;-   identify the repetitious CSI transmission setting based on    determining that the distinct DMRS pattern as the first DMRS    pattern; and-   identify the non-repetitious CSI transmission setting based on    determining that the distinct DMRS pattern as the second DMRS    pattern.

30. The apparatus of any preceding clause, wherein the CSI reportconfiguration information further includes at least one of:

-   a set of multiple associated DMRS patterns for the CSI report, or-   a correspondence of the distinct DMRS pattern to a subsequent CSI    report transmission.

As used herein, a phrase referring to “at least one of” a list of itemsrefers to any combination of those items, including single members. Asan example, “at least one of: a, b, or c” is intended to cover: a, b, c,a-b, a-c, b-c, and a-b-c.

The various illustrative logics, logical blocks, modules, circuits andalgorithm processes described in connection with the aspects disclosedherein may be implemented as electronic hardware, computer software, orcombinations of both. The interchangeability of hardware and softwarehas been described generally, in terms of functionality, and illustratedin the various illustrative components, blocks, modules, circuits andprocesses described above. Whether such functionality is implemented inhardware or software depends upon the particular application and designconstraints imposed on the overall system.

The hardware and data processing apparatus used to implement the variousillustrative logics, logical blocks, modules and circuits described inconnection with the aspects disclosed herein may be implemented orperformed with a general purpose single-or multi-chip processor, adigital signal processor (DSP), an application specific integratedcircuit (ASIC), a field programmable gate array (FPGA) or otherprogrammable logic device, discrete gate or transistor logic, discretehardware components, or any combination thereof designed to perform thefunctions described herein. A general purpose processor may be amicroprocessor, or, any conventional processor, controller,microcontroller, or state machine. A processor also may be implementedas a combination of computing devices, e.g., a combination of a DSP anda microprocessor, a plurality of microprocessors, one or moremicroprocessors in conjunction with a DSP core, or any other suchconfiguration. In some aspects, particular processes and methods may beperformed by circuitry that is specific to a given function.

In one or more aspects, the functions described may be implemented inhardware, digital electronic circuitry, computer software, firmware,including the structures disclosed in this specification and theirstructural equivalents thereof, or in any combination thereof. Aspectsof the subject matter described in this specification also can beimplemented as one or more computer programs, i.e., one or more modulesof computer program instructions, encoded on a computer storage mediafor execution by, or to control the operation of, data processingapparatus.

If implemented in software, the functions may be stored on ortransmitted over as one or more instructions or code on acomputer-readable medium. The processes of a method or algorithmdisclosed herein may be implemented in a processor-executable softwaremodule which may reside on a computer-readable medium. Computer-readablemedia includes both computer storage media and communication mediaincluding any medium that can be enabled to transfer a computer programfrom one place to another. A storage media may be any available mediathat may be accessed by a computer. By way of example, and notlimitation, such computer-readable media may include RAM, ROM, EEPROM,CD-ROM or other optical disk storage, magnetic disk storage or othermagnetic storage devices, or any other medium that may be used to storedesired program code in the form of instructions or data structures andthat may be accessed by a computer. Also, any connection can be properlytermed a computer-readable medium. Disk and disc, as used herein,includes compact disc (CD), laser disc, optical disc, digital versatiledisc (DVD), floppy disk, and Blu-ray disc where disks usually reproducedata magnetically, while discs reproduce data optically with lasers.Combinations of the above should also be included within the scope ofcomputer-readable media. Additionally, the operations of a method oralgorithm may reside as one or any combination or set of codes andinstructions on a machine readable medium and computer-readable medium,which may be incorporated into a computer program product.

Various modifications to the aspects described in this disclosure may bereadily apparent to those skilled in the art, and the generic principlesdefined herein may be applied to other aspects without departing fromthe spirit or scope of this disclosure. Thus, the claims are notintended to be limited to the aspects shown herein, but are to beaccorded the widest scope consistent with this disclosure, theprinciples and the novel features disclosed herein.

Additionally, a person having ordinary skill in the art will readilyappreciate, the terms “upper” and “lower” are sometimes used for ease ofdescribing the figures, and indicate relative positions corresponding tothe orientation of the figure on a properly oriented page, and may notreflect the proper orientation of any device as implemented.

Certain features that are described in this specification in the contextof separate aspects also can be implemented in combination in a singleaspect. Conversely, various features that are described in the contextof a single aspect also can be implemented in multiple aspectsseparately or in any suitable subcombination. Moreover, althoughfeatures may be described above as acting in certain combinations andeven initially claimed as such, one or more features from a claimedcombination can in some cases be excised from the combination, and theclaimed combination may be directed to a subcombination or variation ofa subcombination.

Similarly, while operations are depicted in the drawings in a particularorder, this should not be understood as requiring that such operationsbe performed in the particular order shown or in sequential order, orthat all illustrated operations be performed, to achieve desirableresults. Further, the drawings may schematically depict one more exampleprocesses in the form of a flow diagram. However, other operations thatare not depicted can be incorporated in the example processes that areschematically illustrated. For example, one or more additionaloperations can be performed before, after, simultaneously, or betweenany of the illustrated operations. In certain circumstances,multitasking and parallel processing may be advantageous. Moreover, theseparation of various system components in the aspects described aboveshould not be understood as requiring such separation in all aspects,and it should be understood that the described program components andsystems can generally be integrated together in a single softwareproduct or packaged into multiple software products. Additionally, otheraspects are within the scope of the following claims. In some cases, theactions recited in the claims can be performed in a different order andstill achieve desirable results.

What is claimed is:
 1. A method of wireless communication at a user equipment (UE), comprising: obtaining at least one measurement of a communication channel associated with a network entity; determining a channel state information (CSI) transmission setting based on the at least one measurement of the communication channel, wherein the CSI transmission setting is associated with a distinct demodulation reference signal (DMRS) pattern; and transmitting a CSI report with the distinct DMRS pattern to the network entity in accordance with the CSI transmission setting.
 2. The method of claim 1, wherein the CSI transmission setting corresponds to one of a repetitious CSI transmission setting or a non-repetitious CSI transmission setting.
 3. The method of claim 2, wherein the repetitious CSI transmission setting corresponds to a periodic CSI transmission and the non-repetitious CSI transmission setting corresponds to a semi-persistent CSI transmission.
 4. The method of claim 3, further comprising: receiving downlink control information (DCI) that activates the CSI report associated with the semi-persistent CSI transmission; and determining one or both of an option for a subsequent transmission of the CSI report or a correspondence of the distinct DMRS pattern to the subsequent transmission of the CSI report based on the DCI.
 5. The method of claim 2, wherein the repetitious CSI transmission setting is associated with a first DMRS pattern and the non-repetitious CSI transmission setting is associated with a second DMRS pattern, and wherein transmitting the distinct DMRS pattern includes: transmitting the first DMRS pattern based on determining that the CSI transmission setting corresponds to the repetitious CSI transmission setting; and transmitting the second DMRS pattern based on determining that the CSI transmission setting corresponds to the non-repetitious CSI transmission setting.
 6. The method of claim 1, further comprising: determining that a non-transmission period has elapsed after transmitting the CSI report, wherein the non-transmission period permits reservation of spatial resources for reception by the network entity; and transmitting a subsequent CSI report based on determining that the non-transmission period has elapsed.
 7. The method of claim 1, further comprising receiving CSI report configuration information from the network entity including at least one of: a set of multiple associated DMRS patterns for the CSI report, or a correspondence of the distinct DMRS pattern to a subsequent CSI report transmission.
 8. The method of claim 1, further comprising receiving CSI report setting configuration information including criteria for selecting the CSI transmission setting, wherein the criteria includes at least one parameter corresponding to a channel measurement threshold that triggers selection of the distinct DMRS pattern.
 9. The method of claim 1, wherein the at least one measurement corresponds to: a downlink reception quality indicator, a reference signal received power (RSRP), or a signal-to-interference noise ratio (SINR).
 10. A method of wireless communication at a network entity, comprising: transmitting channel state information (CSI) setting configuration information to a user equipment (UE), the CSI setting configuration information including at least one parameter corresponding to a channel measurement threshold that triggers selection of a distinct demodulation reference signal (DMRS) pattern based on a CSI transmission setting; and receiving a CSI report and the distinct DMRS pattern from the UE associated with the CSI transmission setting.
 11. The method of claim 10, wherein the CSI transmission setting corresponds to one of a repetitious CSI transmission setting or a non-repetitious CSI transmission setting.
 12. The method of claim 11, wherein the repetitious CSI transmission setting corresponds to a periodic CSI transmission and the non-repetitious CSI transmission setting corresponds to a semi-persistent CSI transmission.
 13. The method of claim 12, further comprising transmitting downlink control information (DCI) that activates the CSI report associated with the semi-persistent CSI transmission.
 14. The method of claim 11, wherein the repetitious CSI transmission setting is associated with a first DMRS pattern and the non-repetitious CSI transmission setting is associated with a second DMRS pattern, the method further comprising: determining whether the distinct DMRS pattern corresponds to the DMRS pattern or the second DMRS pattern; identifying the repetitious CSI transmission setting based on determining that the distinct DMRS pattern as the first DMRS pattern; and identifying the non-repetitious CSI transmission setting based on determining that the distinct DMRS pattern as the second DMRS pattern.
 15. The method of claim 10, wherein the CSI report configuration information further includes at least one of: a set of multiple associated DMRS patterns for the CSI report, or a correspondence of the distinct DMRS pattern to a subsequent CSI report transmission.
 16. An apparatus for wireless communication, comprising: a transceiver; a memory configured to store instructions; and at least one processor communicatively coupled with the transceiver and the memory, wherein the at least one processor is configured to: obtain at least one measurement of a communication channel associated with a network entity; determine a channel state information (CSI) transmission setting based on the at least one measurement of the communication channel, wherein the CSI transmission setting is associated with a distinct demodulation reference signal (DMRS) pattern; and transmit a CSI report with the distinct DMRS pattern to the network entity in accordance with the CSI transmission setting.
 17. The apparatus of claim 16, wherein the CSI transmission setting corresponds to one of a repetitious CSI transmission setting or a non-repetitious CSI transmission setting.
 18. The apparatus of claim 17, wherein the repetitious CSI transmission setting corresponds to a periodic CSI transmission and the non-repetitious CSI transmission setting corresponds to a semi-persistent CSI transmission.
 19. The apparatus of claim 18, wherein the at least one processor is further configured to: receive downlink control information (DCI) that activates the CSI report associated with the semi-persistent CSI transmission; and determine one or both of an option for a subsequent transmission of the CSI report or a correspondence of the distinct DMRS pattern to the subsequent transmission of the CSI report based on the DCI.
 20. The apparatus of claim 17, wherein the repetitious CSI transmission setting is associated with a first DMRS pattern and the non-repetitious CSI transmission setting is associated with a second DMRS pattern, and wherein to transmit the distinct DMRS pattern, the at least one processor is further configured to: transmit the first DMRS pattern based on determining that the CSI transmission setting corresponds to the repetitious CSI transmission setting; and transmit the second DMRS pattern based on determining that the CSI transmission setting corresponds to the non-repetitious CSI transmission setting.
 21. The apparatus of claim 16, wherein the at least one processor is further configured to: determine that a non-transmission period has elapsed after transmitting the CSI report, wherein the non-transmission period permits reservation of spatial resources for reception by the network entity; and transmit a subsequent CSI report based on determining that the non-transmission period has elapsed.
 22. The apparatus of claim 16, wherein the at least one processor is further configured to receive CSI report configuration information from the network entity including at least one of: a set of multiple associated DMRS patterns for the CSI report, or a correspondence of the distinct DMRS pattern to a subsequent CSI report transmission.
 23. The apparatus of claim 16, wherein the at least one processor is further configured to receive CSI report setting configuration information including criteria for selecting the CSI transmission setting, wherein the criteria includes at least one parameter corresponding to a channel measurement threshold that triggers selection of the distinct DMRS pattern.
 24. The apparatus of claim 16, wherein the at least one measurement corresponds to: a downlink reception quality indicator, a reference signal received power (RSRP), or a signal-to-interference noise ratio (SINR).
 25. An apparatus for wireless communication, comprising: a transceiver; a memory configured to store instructions; and at least one processor communicatively coupled with the transceiver and the memory, wherein the at least one processor is configured to: transmitting channel state information (CSI) setting configuration information to a user equipment (UE), the CSI setting configuration information including at least one parameter corresponding to a channel measurement threshold that triggers selection of a distinct demodulation reference signal (DMRS) pattern based on a CSI transmission setting; and receiving a CSI report and the distinct DMRS pattern from the UE associated with the CSI transmission setting.
 26. The apparatus of claim 25, wherein the CSI transmission setting corresponds to one of a repetitious CSI transmission setting or a non-repetitious CSI transmission setting.
 27. The apparatus of claim 26, wherein the repetitious CSI transmission setting corresponds to a periodic CSI transmission and the non-repetitious CSI transmission setting corresponds to a semi-persistent CSI transmission.
 28. The apparatus of claim 27, wherein the at least one processor is further configured to transmit downlink control information (DCI) that activates the CSI report associated with the semi-persistent CSI transmission.
 29. The apparatus of claim 26, wherein the repetitious CSI transmission setting is associated with a first DMRS pattern and the non-repetitious CSI transmission setting is associated with a second DMRS pattern, wherein the at least one processor is further configured to: determine whether the distinct DMRS pattern corresponds to the DMRS pattern or the second DMRS pattern; identify the repetitious CSI transmission setting based on determining that the distinct DMRS pattern as the first DMRS pattern; and identify the non-repetitious CSI transmission setting based on determining that the distinct DMRS pattern as the second DMRS pattern.
 30. The apparatus of claim 25, wherein the CSI report configuration information further includes at least one of: a set of multiple associated DMRS patterns for the CSI report, or a correspondence of the distinct DMRS pattern to a subsequent CSI report transmission. 